Multiple chuck turret



Aug. 10, 1943. R. (5. LE TOURNEAU 2,326,371

MULTIPLE CHUCK TURRET Filed Oct. 25, 1641 I 2 She ets-Sheet 1 INVENTORR. (ZZeZZJurncau Aug. 10, 1943.

RQG. LE TOURNEAU MULTIPLE CHUCK TURRET Filed Oct. 25, 1941 2Sheets-Sheet 2 r a tluu ie v INVENTOR R. GZZIeTOurneau imam A TTYSPatented Aug. l0, 1943 w UNITED. TA E PAT f MULTIPLE-CHUCK TURRET RobertG. Le 'I-curneau, Peoria, 111., assignor-tcy v .RLG. Le Tourneau, Inc.,a corporation Application October '25, 1941, Serial N 16,514 Q Claim.(o1. 29 38) f This invention'relates' in general to machine lathes; andin particular the invention isdirected to, :and it is theprincipalobject'to provide, a unique multiple chuck turret for a machine lathe.

Another object'of the invention is to provide a multiple chuck turretwhich includes novel means mounting the multiple chucks for ready move;

ment one after the other to different positions able manner on ,atails'tock spindle whereby the turret may be advanced or retracte'dlengthwise of the lathe bed, while maintaining plate I non-rotatable.

for' machining of the chucked work;-said means P including fastreleasable instrumentalities"hormally securing the turret'turning discagainst rotation and axial movement relative to the turret quill plate.I Afurther object of the invention is to provide a work holding chuckwhich embodies novel jaw assembly and related'mechanism; thechuck-ineluding means toretract the'w'ork axially and the jaws-beingarranged so that upon engagement by the work and said'axial movement ofthe latter, the jaws automatically move radiallyinward to grip andcenter said work.

It is also an object of the invention to provide a multiple chuck turrethaving individual chucks as in the preceding paragraph, and which aredesigned particularly to engage, center and hold work having an eye onone end thereof, as forv example, lifting plugs for projectiles.

A further object of the invention is to proence indicate correspondingparts in the several views:

Figure 1 is a front elevation of the multiple 7 40 Figure 2 is asectional elevation of the turret chuck turret.

on line 22 of Fig. l.

' axis of the face plate'6.

Figure 3 is a cross section of one of the chucks taken on line 3--3 ofFig. 1.

Figure 4 is a sectional view of the work re-' tainer or draw bodyembodied in eachof the chucks, taken on line 4-4 of Fig. 3. a 7

Referring now more particularly to the characters of reference onthedrawings, the device comprises a heavy-duty back or quill plate 1 of,

circular configuration and having an axially projecting attachmentsleeve 2 fixed thereto at the 7 back, by means of a flanged countersunkend portion 3 retained by bolts 4; such attachment sleeve being adaptedto be mounted in a suit- A stub shaft 5 extends in fixed relationaxially 1 through the back plate I and projectsa'short distance beyondthe. face thereof. A circular turning disc or face plate 6 is disposedinface to face engagement with back plate land is rotatably and slidablymounted on the projecting portion of stub shaft 5 by means of ananti-friction bearing 1.- .A friction holding disc 8. of relativelysmall diameter engages face plate 6 centrally, and a stem 9, extendsaxially through said disc and is threaded j into the stub shaft; theouter end of said stem beingformed as a head .I 0. Disc cams are pivotedas at 12 onopposite sides'of the head andare arranged upon rotation towedge against holding disc 8,,Which in turn I,

frictionallylocks fthe face plate 16 against back plate I. A handle l3issecured in cams substantially tangentially thereof and when said camsare in locking position the handle projects radially of theturret, asshown in Figs. land2.

6 in evenly spaced relation: circumferentially thereofand about thefriction holding disc 8, the handle [3 being in' aradial plane betweencertain adjacent chucks. The chuck bodies, which are of substantialthickness, are rigidly attached to'the face plate by means of cap screwsIS; the axis of said chucks being parallel to the As each chuck is ofthe same construction, a

description of one will sufiice for the purpose'of this specification.The cylindrical chuck body I4 is formed with a central 'or axial socketI6 of substantial di-' ameter and depth, which opens forwardly. A

plurality of evenly spaced radial'jaw-receiving slots 11 are cut in theouter faceof the chuck body and extendjfrom socket l6 to the peripheryofsaid body. Chuck'jawslil aredisposed edge- I wise in said slots andare pivoted therein at l9 for swinging movement in a directionlengthwise of the chuck body. 7 I i At their radially inner and forwardcorners the jaws are each formed with a work engaging notch zll disposedahead'of their pivots axially i of th'echuck. The edge of each notchformsa work abutment shoulder and the outer edge thereof is serrated toprovide the work gripping face. The radially inner and rearwardcornersof the jaws arecut away or beveled to provide A plurality of chucks,whose cylindrical bodies 1 r are indicated at l4,'are mounted on thefaceplate rilsuflicient clearance for a draw body 2! slidably disposedin socket l6 rearwardly of said jaws.

asat 22 fo face plate 6, and an adjustment nu'tiil is thread ed on thebolt in said recess. 4

Access to the nut 30 of each chuck is had through an opening 3| in theback plate I.

When the work is secured by its eye to the drawbody and the nutthereafter taken up, inward motion of the draw body' and work results asthe work is engaged at circumferentially spaced points in jaw notches26. Such inward motion likewise results in inward swinging movement ofthe-jaws anduntil the serrated jaw" portionsloite into the work with sam action securing the work in the chuck for machining such as endcutting, threading, etc, The diameterfof the work where. engaged by thejaw notches is of course smaller, than that of the notch circle when thejaws initially engage the work.

At ci-rcumferentiallyspaced ,pointslin: itsyperiphery, andcorresponding-to the spacing gfthe chucks; the face plate is notched asindicated at 32. A spring pressed dog 33-, slidablejn'a radialhousing 34mounted onithe backplate i and overhanging the faceplate; normally-en Vgages in one of said notches 32, but-is releasable by means of a camaction I lever 35 connected with the outer end-of dog 33. i 1

I This draw body is slotted across and to a V substantial depth from itsforward or outer end erception vof the eye 23 on the work 24 which ishere shown as being the cylin- With release of dog 33, together withfriction disc 8, the face plate maybe rotated relative to the back plateso that in this manner the chucks may progressively be moved from onestation to another; the. lathe preferably being set up toeffect'difierent but simultaneous machining operations at the differentstations. r

From the foregoing description it will be readily seenthat I haveproduced such a device as substantially fulfills thecbjects of theinvention as set forth herein.

While this specification T present and preferred construction of thedevice,

still in practice such deviations from such detail maybe resorted to asdo not form a departure from the spirit of. the invention, as defined bythe appended claim.-

Having thus described my invention, what claim as new and useful anddesire tosecure by Letters Patent is:

A multiple chuck turret comprising a fixed back plate, a rotatable faceplatemountedin face to face engagement therewith, and a plu 'ralityofchucks mounted on the face plate symmetrical and circumferentially;spacedfrela tion, said chucks each including fa chuck jaw actu'atihgbolt'projectin'g paralie te tire chuck axis inwardly into a recessformedlin and which opens tothe back'f of said face plate, a nutthreadedlo'n theboltand seated in'the recess,

both the bolt and nut terminatingshort of the 'planeof the back surfaceof said face plate; the

back plate normally overlying said recessesinut having a tool accessopeningdisposed to succes si vely registerg with said recessesluponrotation ofthe-face plate and meanstoreleasably'hold the face plate against movement relative to the back platewhen any suchregistryobtainedg"ROBERT G. ToURun U.

sets forth in detail the x

